package org.ajc.gift.controller;

import com.aliyun.oss.OSS;
import com.aliyun.oss.OSSClientBuilder;
import com.aliyun.oss.common.auth.CredentialsProviderFactory;
import com.aliyun.oss.common.auth.EnvironmentVariableCredentialsProvider;
import com.aliyun.oss.common.utils.BinaryUtil;
import com.aliyun.oss.model.MatchMode;
import com.aliyun.oss.model.PolicyConditions;
import org.ajc.gift.util.AjaxResult;
import org.aspectj.weaver.loadtime.Aj;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import java.util.Date;
import java.util.LinkedHashMap;
import java.util.Map;

@RestController
@RequestMapping("/aliyun/oss")
public class AliYunOssController {

    @GetMapping("/sign")
    public AjaxResult getSign(){
        // 参数写死不太好--可以配置在Config配置文件里面--方便后面改代码时不用改后端代码只改配置文件就OK
        String endpoint = "oss-cn-chengdu.aliyuncs.com";
        // 填写Bucket名称，
        String bucket = "ajc-gift-20231023"; //桶名
        // 填写Host名称，格式为https://桶名.endpoint。
        String host = "https://"+bucket+"."+endpoint;

        //子账号
        String accessKeyId = "LTAI5tLgbk3Uup8q9QqdTE7C";
        String accessKeySecret = "nXC8Ylf8CblQBSY3rOuN4yq9ekrgbW";

        // 设置上传到OSS文件的前缀，可置空此项。置空后，文件将上传至Bucket的根目录下。
        String dir = "images/"; //桶下的文件目录

        // 创建OSSClient实例。
        OSS ossClient = new OSSClientBuilder().build(endpoint,accessKeyId, accessKeySecret);
        try {
            long expireTime = 30;
            long expireEndTime = System.currentTimeMillis() + expireTime * 1000;
            Date expiration = new Date(expireEndTime);
            // PostObject请求最大可支持的文件大小为5 GB，即CONTENT_LENGTH_RANGE为5*1024*1024*1024。
            PolicyConditions policyConds = new PolicyConditions();
            policyConds.addConditionItem(PolicyConditions.COND_CONTENT_LENGTH_RANGE, 0, 1048576000);
            policyConds.addConditionItem(MatchMode.StartWith, PolicyConditions.COND_KEY, dir);

            String postPolicy = ossClient.generatePostPolicy(expiration, policyConds);
            byte[] binaryData = postPolicy.getBytes("utf-8");

            String encodedPolicy = BinaryUtil.toBase64String(binaryData);
            String postSignature = ossClient.calculatePostSignature(postPolicy);

            //这个map是要返回给前端的
            Map<String, String> respMap = new LinkedHashMap<String, String>();
            respMap.put("accessId", accessKeyId);
            respMap.put("policy", encodedPolicy);
            respMap.put("signature", postSignature);  //获取到的签名
            respMap.put("dir", dir);
            respMap.put("host", host);
            respMap.put("expire", String.valueOf(expireEndTime / 1000));
            // respMap.put("expire", formatISO8601Date(expiration));

            return AjaxResult.me().setResultObj(respMap);
        } catch (Exception e) {
            System.out.println(e.getMessage());
            return AjaxResult.me().setSuccess(false).setMessage("获取签名失败！！！");
        } finally {
            ossClient.shutdown();
        }
    }
}
